This VCO with discrete components was found documentation from the 1980s. The central frequency with the indicated components is 8 kHz. A BC548 can be used for Q1.
Published in 1988 in Hands-On Electronics, this circuit converts the 12 V of a battery into 120 V...
This circuit was found in an American technical manual from the 1980s. The LM111 is an uncommon...
This circuit was obtained in an American publication of the time. Transistors are commonly used. The...